LED filament and LED light bulb
US11997768B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2021 |
| Grant date | May 28, 2024 |
| Priority date | — |
| Expiry date | Oct 26, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/882
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An LED filament comprising a plurality of LED filament units, each of the plurality of LED filament units includes a LED chip with an upper surface and a lower surface opposite to the upper surface of the LED chip, and a light conversion layer comprising a top layer and a base layer, and the base layer comprises an upper surface and a lower surface opposite to the upper surface of the base layer, where the top layer with an upper surface and a lower surface opposite to the upper surface of the top layer is disposed on at least two sides of each of the LED chips, the lower surface of each of the LED chips is close to the upper surface of the base layer, and the upper surface of the top layer is away from each of the LED chips.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.